[Talk-is] OSM Iceland road network data analysis

[michael.hofer50 at a1.net]

Komið þið sæl og blessuð.
   
  My Icelandic language skills are not good enough to write a letter so I’m writing my message in English.
   
  I did in the last time a road network analysis on OSM Iceland data. Here I checked with the road list from vegagerdin http://www.vegagerdin.is/vefur2.nsf/Files/Vegaskra_2015/$file/Vegaskra_2015.xlsx <http://www.vegagerdin.is/vefur2.nsf/Files/Vegaskra_2015/$file/Vegaskra_2015.xlsx> , if the roads and segments of roads are mapped correspondingly to the list.
   
  As mapping basis I took the information from the OSM Iceland Wiki. Unfortunately this wiki wasn’t actualised in the last years, probably because it’s an awful manual work. I don´t know if there exist a plug in to actualise the road list in the wiki with a set of Overpass-queries. The information there is included in OSM, but not extracted and processed to the wiki yet.
   
  In the road list from vegagerdin exist a new road network type "Sx". The Kjalvegur for example has this network type. I understand it as primary highland route, but left the mapped road as it was.
   
  I focused on the 1 to 3 digits road reference numbers, the four digit roads I only looked at, when I strolled over it. When I found information about the road, mostly in OSM I tried to fix it immediately.
   
  A few roads I found which I couldn’t identify in OSM. The road might exist with a different name and without the mapped reference number. As I can’t state a fixme statement on elements which I didn’t find, I list the roads here:
  378 01  Skíðaskálavegur Hringvegur (1-d8), við Skíðaskála Hringvegur (1-d8)
  413 03  Breiðholtsbraut Reykjanesbraut            Hafnarfjarðarvegur (40)
  419 01  Höfðabakki  Reykjanesbraut              Nesbraut (49)
  419 02  Höfðabakki  Nesbraut                Hallsvegur (432)
  470 01  Fjarðarbraut  Hafnarfjarðarvegur          Hafnarfjörður, Lækjargata
  470 02  Fjarðarbraut  Ástorg                Hafnarsvæði
  470 02  Fjarðarbraut  Hafnarfjörður, Lækjargata     Hafnarfjörður, Hvaleyrarbraut
  628 01  Hjarðardalsvegur  Vestfjarðavegur (60-43)     Hjarðardalur
  713 01  Hvítserksvegur  Vatnsnesvegur (711-05)  711-05    Hvítserkur, bílastæði
  757 01  Villinganesvegur  Skagafjarðarvegur (752-03)    Villinganes
  830 02  Svalbarðseyrarvegur Hringvegur (1-q2)       Svalbarðseyri, Laugartún
  845 02  Aðaldalsvegur Staðarbraut (854-01)        Norðausturvegur (85-03)
  846 01  Austurhlíðarvegur Hringvegur (1-q8)       Stóru-Laugar
  859 01  Hafnarvegur Húsavík Norðausturvegur (85-05)     Hafnarsvæði, endi gangbrautar
  865 01  Gilsbakkavegur  Norðausturvegur (85-12)       Gilhagi 1
  897 01  Svalbarðstunguvegur Norðausturvegur (85-24)     Fjallalækjarsel
  942 01  Steinsvaðsvegur Borgarfjarðarvegur (94-04)      Stóra-Steinsvað
  942 02  Tjarnarlandsvegur Steinsvaðsvegur (942-01)    Tjarnarland
  948 01  Gilsárteigsvegur  Borgarfjarðarvegur (94-03)    Gilsárteigur 1
  949 01  Þrándarstaðavegur Borgarfjarðarvegur (94-01)    Þrep
  2284  01  Sólheimahjáleiguvegur Mýrdalsjökulsvegur (222-01)   Sólheimahjáleiga
  2285  01  Ytri-Sólheimavegur  Mýrdalsjökulsvegur (222-01)     Ytri-Sólheimar 3
  2286  01  Ytri-Sólheimavegur 1  Mýrdalsjökulsvegur (222-02)   Ytri-Sólheimar 1
  7079  01  Núpsdalstunguvegur  Arnarvatnsvegur (578-05)      Núpsdalstunga
   
  The following roads mapped in OSM I couldn´t find in the road list from vegagerdin or the mapped road don’t correspond with the information in the vegagerdin road list:
  882 01  Leyningshólavegur Villingadalsvegur (8370-01)   Leyningshólar
  915   Vesturárdalsvegur
  2001  01
   
  There are lots of roads in the list, where I couldn’t find the places from the list, especially when the road leads to a farm or house.
   
  The list also gives the road length, where the length is measured over ground I guess. OSM has no elevation in the map so the measured road length is as the ground would be flat. The difference between these values should be under 10%. Unfortunately the difference on lots of the roads is much higher (up to 50%).
  One reason for this could be that the road with certain reference number is much further mapped as vegagerdin states it. But on some roads also the mapping quality might be poor. But also on these I didn’t focus. I might try to improve the map in future when there is some time for it.
   
  Also I realised that outside Reykjavík in the villages most of the schools aren’t mapped.  The schools are used in summer as guesthouse, so only the tourist infrastructure is mapped. Is this still correct? How to map this in OSM?
   
  I hope that the Icelandic community have a look on some of the items.
   
   
  Gleðileg jól og farsælt komandi ár
   
   
  Michal Hofer
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